I am a moderately experienced RE investor looking for advice on investing in high-equity growth opportunities. 

Note purchasing is a very sophisticated strategy best suited for well funded and highly experienced investors.

Amongst knowledgable, experienced investors the disagreement concerning sub to is between those who believe it’s too dangerous to be a legit strategy and those who while agreeing to the dangers think when handled by experienced, knowledgable, well capitalized investors it can be a strategy with benefits to both sides.   

I lead our DST due diligence within our RIA, and what you are experiencing is unfortunate and rare if you have the right sponsor.

Talk to a mortgage broker or lender experienced with LLC-owned properties before transferring ownership.

This is so scary, I would NEVER do this type of deal again, and many investors are experiencing the same thing, except some are not even aware of the seriousness of their investment losses yet.  

We have done it both ways where we fund purchase and they cover rehab but if the individual is less experienced we do not do it that way, we have them put more money into the deal from the start and fund the draws, reason why is we also had a deal where the person said they would do this and never did anything and property sat and loan matured and it was a pain.Just recognize you will still not get 100% financing for the purchase, so you are putting money in up front. 

While this is indirect, a less experienced sponsor is not going to be able to attract capital like a seasoned sponsor, regardless of securities being exempt or not.  

There are aggressive lenders out there with lower fees for experienced flippers.  

Tenants will push and try to get everything they can from their landlord.Seems you've done everything possible to be reasonable, yet the tenant is not satisified and wants more.As already stated, you are too much of a pushover, so the tenant is seeing how much farther they can push you.Highly advise you to find an experienced residential landlord-tenant attorney ASAP.